Wireless router connected to two wireless PC's and two hard-wired PC's

I tried playing around with Bandwidth Monitor but i'm still not happy with the results. Here's my problem.. I have a wireless router connected to TWO wireless PC's and TWO hard-wired PC's. I want to limit the bandwidth on 1 of the wireless computers, and one hard-wired computer. I noticed that the only way to effectively limit the bandwidth is to select 'any protocol' under the rules options. Whenever I select, tcp/udp or both, nothing at all changes. But the problem with selecting 'any protocol' is that you can't specify any ip addresses, etc. Help?

I have installed Bandwidth manager on the hard-wired PC (the one that i want to limit it's bandwidth).

As for the rules, I always have the direction on 'either'. The Transfer rate limit is set at 16000 Bps (for testing purposes to see if it works, i set it at 2000). As i mentioned earlier, the only Protocol that seems to work is 'All protocols', which is useless since you can't specify an ip address, etc. And for the interface, i put it on 'Any interface'.

It is a relative thing. Basically, source is the address where a packet comes from, destination is the address where a packet comes to. So, if the bandwidth manager is installed on a workstation, source can be local host and destination can be any IP address.